ZyXEL MSAP2000 Manuel d'utilisateur télécharger pdf (Page 228)

228

MSAP2000 AAMS User’s Guide

Discrete Multi-Tone (DMT) modulation divides up a line’s bandwidth into tones.

This command displays the number of bits transmitted for each tone. This can be

used to determine the quality of the connection, whether a given sub-carrier loop

has sufficient margins to support ADSL transmission rates, and possibly to

determine whether certain specific types of interference or line attenuation exist.

Refer to the ITU-T G.992.1 recommendation for more information on DMT.

The better (or shorter) the line, the higher the number of bits transmitted for a

DMT tone. The maximum number of bits that can be transmitted per DMT tone is

15.

“upstream carrier load” displays the number of bits transmitted per DMT tone for

the upstream channel (from the subscriber’s DSL modem or router to the

MSAP2000 AAMS).

“downstream carrier load” displays the number of bits received per DMT

tone for the downstream channel (from the MSAP2000 AAMS to the

subscriber’s DSL modem or router).

The bit allocation contents are only valid when the link is up.

In the following example, the upstream channel is carried on tones 7 to 39 and the

downstream channel is carried on tones 53 to 259 (space is left between the

channels to avoid interference).

Figure 143 Linedata Command Example

ras> statistics adsl linedata 1

[port 1]

up stream carrier load: number of bits per symbol(tone):

tone 0- 19: 00 00 00 00 00 00 02 03 04 05 - 06 07 07 07 07 07 07 07 08 08

tone 20- 39: 08 08 07 08 08 07 07 06 06 05 - 04 03

down stream carrier load: number of bits per symbol(tone):

tone 0- 19: 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 tone 20- 39: 00 00

00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 tone 40- 59: 00 00 00 00 00 00 00 00 00

00 - 00 00 00 01 01 01 01 01 01 02 tone 60- 79: 02 02 02 02 00 02 02 02 02 02 - 02 02 02 02 02 02

02 02 02 02 tone 80- 99: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02 tone

100- 119: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02 tone 120- 139: 02 02 02 02

02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02 tone 140- 159: 02 02 02 02 02 02 02 02 02 02 -

02 02 02 02 02 02 02 02 02 02 tone 160- 179: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02

02 02 02 tone 180- 199: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02 tone 200-

219: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02 tone 220- 239: 02 02 02 02 02

02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02 tone 240- 259: 02 02 02 02 02 02 02 02 02 02 - 02

02 02 02 02 02

29.4.3 Statistics ADSL Lineinfo Command

Syntax:

statistics adsl lineinfo <portlist>

1 2 ... 223 224 225 226 227 228 229 230 231 232 233 ... 247 248

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ZyXEL MSAP2000 Manuel d'utilisateur Page 228